The vit ( vitellin) eggs of Bombyx mori deposited by the females homozygous for the mutation were investigated for the manifestation of inherited characteristics. Mutant eggs produced by vit/vit ovaries were white in color due to the lack of yolk proteins. These eggs could be fertilized and grown to the final stage of embryogenesis but did not hatch and died, irrespective of whether the genotype of embryo was homozygous or heterozygous for the vit gene. Mating experiments showed that the trait of yolk color was transmitted in a manner of pseudomaternal inheritance, whereas the character of embryonic lethality was manifested following a mode of maternal inheritance.

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The purpose of this paper is to present sufficient conditions for the stochastic observability of nonlinear systems under randomly interrupted observations.
First, the observation mechanism with interrupted data is modeled by introducing the Poisson process. Then both the finite time stochastic observability and the asymptotically stochastic observability are defined. Finally, by using a Lyapunov-type function, theorems giving sufficient conditions are presented and the stochastic convergence of the estimator is examined.
For the purpose of supporting the theoretical development here, results of simulation studies are also given.

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A malignant basal cell tumor was found in the skin of the abdomen of a female Djungarian hamster of unknown age and weighing 40 g. Histologically, the tumor mass was composed of cells resembling the basal cells of the epidermis, and these cells exhibited solid type proliferation. In the tumor tissue and necrotic foci, horn cysts were observed. Immunohistochemically, cytokeratin was present in the tumor cells and horncysts. By electron microscopic examination, the tumor cells had cell organelles and a few desmozomes. This paper describes a rare malignant basal cell tumor in a Djungarian hamster.

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74週齢の雄 Sprague-Dawley ラット1例の胸部脊髄に星状膠細胞腫が観察された。組織学的には, 密に増生した腫瘍細胞は明瞭な神経膠線維を随伴した多面形を示し, ヘマトキシリンに濃染する卵円形核と比較的乏しい細胞質を有していた。神経膠線維酸性蛋白(GFAP)に対する免疫組織化学法ではいくつかの腫瘍細胞が陽性を示した。電顕的には, 腫瘍細胞は細胞質内の種々の小胞と乏しい微細線維により特徴づけられた。

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Knowledge of runoff characteristics plays an important role in managing the function of water conservation in the forests. Hydrological observation was conducted at Bukit Tarek Experimental Watershed (BTEW) of a tropical rain forest in Peninsular Malaysia. Stormflow, groundwater recession and stream regimen characteristics were analyzed based on 3-y (1992-1994) of record. Small storm events (< 30 mm) produced less than 10% of rainfall as stormflow, which may have been determined in the stream channel and riparian areas. The stormflow depended strongly on the antecedent wetness as represented by the antecedent flow rate during large storm events (≥ 30 mm). The depth and physical properties of soils could be important factors to determine production of stormflow. The discharge-duration curves were different among 1992, 1993 and 1994 because of the differences of variation in rainfall (e.g. monthly distribution) and annual rainfall. The relationship between ratio of plentiful runoff to runoff and recession coefficient at BTEW was similar to the results from watershed underlain by the same geology in Japan. These results imply that soil, variation in rainfall, as well as annual rainfall and geology are important factors to understand runoff characteristics.

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Studying on the relation between the quantities of the next three groups-eggs of fishes, larvae of fishes and plankton-collected simultaneously by a horizontal surface haul with the larval net, the following results were obtained. 1. When abundant (more than 1,000 individuals) eggs of fishes are collected, the other two groups were rather : When abundant (more than 1,000 individuals) larvae of fishes are collected, the other two groups were rather : and likewise when abundant (more than 200cc in settling volume) plankton are collected, the other two groups were . It never happened that two or all of these three groups were collected in abundance at the same time. 2. The reverse to above mentioned relation does not hold good, two or three groups may be simultaneously. 3. When the eggs of the fishes (or another group) are collected in abundance fully, in the general case, one special species of the group among it was extremely dominant. Considering the above mentioned facts, it is supposed that the mechanisms of the formation of patches (the dense swarms) are different according to the eggs of the fishes, larvae of the fishes or to the plankton. The patches of these planktonic or semi-planktonic organisms are not due only to the mechanical actions of the external force, but also to the reactions and behaviours of the organisms in various ways according to the species.

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India is a country of varigative climatic changes, which directly and indirectly influence the agricultural productions. The majority of cultivable land of India still seeks sufficient amount of rainfall to enhance the food production, which has strong bearings on the Indian economic growth. In the present study we analyze overall pattern of rainfall variation of India. Agricultural and food grains productions show a significant impact on Gross Domestic Product (GDP) of India, recording a negative growth of about 0.2% in 2000-2001. We conclude that sufficient and adequate rainfall in a year lead to achieve the targeted growth rate while the inadequate use and failure of sufficient rainfall causes stagnation. This is caused by reversal of monsoon, which severely affects the Indian economic growth due to retardation of her agro-economic growth. This study also sheds light on the fact that rainwater is a backbone of agro-economic growth for a developing country like India where vast cultivable land still needs to utilize rainwater resources efficiently by developing indigenous storage device for future. Such steps may help to revert the negative agricultural growth when the failure of monsoon in a particular year occurs.

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背景 : 子宮体部原発の小細胞癌はまれで, 腺癌, 腺扁平上皮癌や悪性ミューラー管混合腫瘍などと共存することが知られている. 小脳転移による症状から発見され, 子宮体部原発の類内膜腺癌と小細胞癌が共存したまれな症例を経験したので報告する.
症例 : 41 歳, 女性. 後頭部痛, 回転性めまいと嘔吐が出現し, 歩けなくなったため, 近医を受診した. MRI 検査で, 左小脳半球に嚢胞性腫瘤を指摘され, 当院で開頭腫瘍摘出術が施行された. 組織学的に, 転移性小細胞癌の可能性が高いと診断され, MRI 検査で, 子宮内腔の腫瘍と多発性子宮筋腫を認めた. 子宮頸部細胞診で, 比較的小型の異型細胞を認め, 子宮内膜細胞診では, 類内膜腺癌と判定された. 子宮および付属器摘出術が施行され, 病理学的検査で, 類内膜腺癌と小細胞癌が共存していた.
結論 : 子宮内膜癌には小細胞癌の成分が混在する可能性があり, 小細胞癌の成分の有無は予後の判断に重要と考えられるので, 注意が必要と思われた.

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Cochliobolus miyabeanusの培地上における子のう殻形成の条件を検討した。Sachs培地を用いた場合,9cmペトリ皿に1.5%寒天として15-20ml分注し,3-4cmに切ったイネわらを1本置床すれば,通常の実験には十分であった。子のう殻の形成は20-24Cの温度範囲で認めたが,この範囲を越えると認められなかった。Sachs培地に置床する植物種と形成との関係を調べた。イネ科植物ではおおむね良好であったが,イネ科以外の植物種では形成の不良な場合がしばしば認められた。
そのほか,Knop,アンズ煎汁(2.5g/l)などの寒天培地,ジャガイモ煎汁(150g, 30g, 3g/l),イネわら煎汁(50g, 10g, 1g/l)などの寒天培地にイネわらを置床した場合に形成が認められた。なお,イネわら煎汁培地(50g, 10g/l)ではイネわらを置床しなくても形成された。
Czapek-糖無添加培地上でも,pH3.7-5.9の場合には,イネわらを置床すれば形成が認められた。Sachs培地にイネもみを置床した場合には,子のう殻の形成がきわめて悪い。これはもみがらによるものであるが,形成不良因子については現在検討中である。

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A 2-year-old Labrador Retriever developed atrophy of the right temporal muscle, subsequently showed generalized seizure and died 2 months after the clinical onset. Postmortem examination revealed the tumor masses in the right mandibulopharyngeal area, nasopharynx and intracranial space. Histopathologically, these tumor masses were composed of small round neoplastic cells and neuropil-like stroma separated by fibrovascular septa. In the neoplastic masses, small neoplastic cells with round to oval hyperchromatic nuclei and cytoplasm predominated, and angulated neoplastic cells with larger nuclei and moderate cytoplasm were scattered. Immunohistochemically, neoplastic cells were positive for neuron specific enorase, neurofilament protein, chromogranin A, synaptophysin and tyrosine hydroxylase. Based on these findings, this case was diagnosed as peripheral neuroblastoma, presumably originated from the sympathetic ganglion, maybe right craninal cervical ganglion.

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A 17-year-old male with effusion in the pleural cavity and a tumor on the left 7th rib was diagnosed by exfoliative cytological and histological examination of pleural fluid and biopsy specimen from the chest wall tumor.
In the pleural effusion, small round cells with nuclear atypia were demonstrated as a mixture of monolayered clusters and single cells, with and indistinct cytoplasm. The nucleus was round, supported by thin and smooth nuclear membrane, and hyperchromatic, showing finely granular chromatin pattern with one or two small but distinct nucleoli. PAS stain demonstrated intracellular glycogen. Histologically, biopsy specimen from the chest wall tumor yielded a diagnosis of round cell tumor, compatible with Ewing's sarcoma.
Differential diagnosis of small round cell tumors was discussed from a morphological point of view.

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A 17-year-old spayed female Japanese domestic cat presented with a solitary cutaneous mass in the right thoracic area. Histopathologically, the mass consisted mainly of round tumor cells that had infiltrated throughout the dermis and deep subcutaneous tissue. The proliferating pattern of tumor cells was solid but also trabecular or cord-like in some areas, and lined with small cells resembling mature lymphocytes or basal cells. The tumor cells were positive for cytokeratin 20 and synaptophysin. The positive reaction for cytokeratin 20 showed localized to diffuse pattern. This is the first report describing now cytokeratin 20 was clearly beneficial for the differential diagnosis of feline Merkel cell carcinoma.

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大豆粒の紫斑はCercosporina Kikuchii sp. n. の寄生に起因す。該菌は唯に大豆粒に紫斑を生ぜしむるのみならず、子葉、尋常葉、莢、稀には莖等にも紫褐色の斑點を出現せしむ。罹病種子を播下すれば、やがて種皮の表面に鼠毛様の黴状物密生す。之を檢鏡すれば橄欖色の檐子梗に無色長鞭状の分生胞子の着生せるを認む。本菌は莢の成長略完成せるも、未だ莢色の緑色を呈せる頃、莢壁を貫通して種實に達するものにして、紫斑部は主として種臍部の附近に多し。莢に挿傷を與ふる時は發病歩合殊に多し。本菌は特種の基體に培養せらるゝ時は夫等の基體に紫色を生ず。但し培養基の種類に依り紫色を生ぜずして褐變せしむることあり。是等の菌糸塊をアルコールに浸漬する時は、酒精液は鮮明なる赤色となる。該液は苛性加里に依り濃緑色となる。更に上述の紫、赤、兩色素の種々藥劑に對する溶解力をも研めたり。尚此外PHに關する關係、本病と耐病性品種との關係等につきても聊報告せり。

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It is well known that the chemical properties of the media play an important part on the bacterial growth. On the contrary, our knowledge of relationship between the bacterial growth and the physical properties of the media is rather , only a few papers having been published on such items as surface tension, osmotic pressure, and what not. T_AKJTA¹⁾ has found abundant growths of Vibrio cholerae, tubercle bacilli etc., when the viscosity of media is of certain degrees. Semi-solid media have been successfully used by several authors for some kinds of bacteria^{2, 3, 4, 5)} In the present experiment, I have studied the effect of the density of the medium upon the growth of bacteria, using various concentrations of agar.

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